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llllilllllllllllllillilllillllllllllllllll WALTER SHEPPERMAN, OFPITTSBURG, PENNSYLVANIA.

Letters Patent N0.'74,725, dated February 18, 1868.

IMPROVEMENT IN CLAMPS FOB. TRUSSING GYLINDERS. 0F STAVES.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, WALTER SHEPPERMAN, of'Pittsburg, in the county ofAllegheny, and State of Penn sylvania, have invented certain new andusefullmprovement's in Screw-Clamps; and I do hereby declare that thefollowing is a full, clear, and exact description'thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form apart of this specification, in which- Figure1 is a plan of my screw-clamp, with one side of the head removed,

Figure 2, a view of one of the pulleys; and

Figure 3 is a view illustrative of the operation of the clamp.

The nature of this invention consists in the employment of a cross-head,provided with friction-rollers, arranged in combination with cord,screw, and block, substantially as hereinafter set forth.

To enable others skilled'in the art to make and use my invention, I willnow describe its construction and operation. I p

A represents the cross-head, formed as seen in fig. 1. Through thecross-head A is inserted the screwb, which penetrates half an inch, moreor less, in the main screw 0, and thus works on a thread cut to receiveit. The neck of screw b is made smooth, so that it will turn easily incross-headA. The cross-head A is furnished with the two friction-rollerse, the object of whic'h will be hereinafter explained. D designates ascrew-block, which may be made of any suitable shape. The block D isscrewed on before the cross-head is secured in position. Near one end ofscrew-block Dis inserted the pin S, in a position parallel with mainscrew 0. The same block I) has two perforations, also parallel with saidmain screw 0. 9 represents a cord, which passes over the top ofcross-head A and the two rollers 2; Each 'end of said cordiis thenpassed through its respective perforationsin screw-hlock D, and thependent ends left sufiiciently long to answerthe purpose to which theclamp is to be applied. The main screw 0 will be furnished with ahandle, that will admit of being firmly grasped. I I I The operation ofmy invention is illustrated by figl3, in which a series of felloes areto he clampedtogeth'er. The said felloes are arranged on the former, inthe position represented in the drawing. The cord y will then he passedaround them, with the cross-head A as near to them as the cord willallow it to come, one end of the cord having been 'knotted, asrepresented in fig. 1, and the other end 'secured 'to the pin 01. Theends of the cord being thnssecur'ed, screw 0 is then turned, untilthetension of the cord 9 is sufiiciently great to closetho joints between.the parts tlin'e clamped, I V I Having thus described my invention,what I claim as new, and desire to secure hyLetters Patent; is-

The cross-head A, provided with rollers e e, in combination with screwG, block D, and cord g,sub s,tanti ally in the manner herein set forthand described.

In testimony that I claim the foregoing as my own I afiix my signaturein presence of two witnesses.

WALTER SHEPPERMAN.

Witnesses:

S. S. Bonus, G. H. Merznn

